package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.http.impl.client.HttpClients;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {

    // 微信服务接口地址
    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private WeChatProperties weChatProperties;

    @Autowired
    private UserMapper userMapper;

    /**
     * 微信登录
     *
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        // 调用微信接口服务 获得当前用户的openid
        String openId = getOpenId(userLoginDTO.getCode());

        // 判断openid是否为空 如果为空登录失败 抛出异常
        if (openId == null) {
            // 登录失败
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }


        // 判断当前登录用户是否是新用户 通过openid查询 如果是新用户 自动完成注册
        User user = userMapper.getByOpenID(openId);
        if (user == null) {
            // 新用户 自动完成注册
            user=User.builder()
                    .openid(openId)
                    .createTime(LocalDateTime.now())
                    .build();
            // 调用userMapper 完成注册
            System.out.println(user);
            userMapper.insert(user);
        }


        // 返回这个用户信息
        return user;

    }


    /**
     * 调用微信接口服务 获取微信用户的openId
     * @param code
     * @return
     */
    private String getOpenId(String code){
        // 调用微信接口服务 获得当前用户的openid
        Map<String, String> map = new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret", weChatProperties.getSecret());
        map.put("js_code", code);
        map.put("grant_type", "authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN, map);


        JSONObject jsonObject = JSON.parseObject(json);
        String openId = jsonObject.getString("openid");
        System.out.println(openId);
        return openId;
    }
}
